Assertion :Mammals have developed a complex respiratory system. Reason: Mammalian skin is impermeable to gases.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Mammals have lungs as respiratory organs. The lungs are spongy and elastic. A unique characteristic of a respiratory system of mammals is the presence of diaphragm. Thus mammals have a complex respiratory system.
Hence, the assertion is correct.
The skin of mammals is covered by horny epidermal hair which acts as an insulator and high body temperature is maintained. Due to the covering of epidermal hair, mammals skin is impermeable to gases.
Hence, the reason is correct.
So both assertion and reason are correct but the reason is not the correct explanation for the assertion.

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